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b in (-oo:+oo)
b+6 = 102-7*b // - 102-7*b
b-(-7*b)-102+6 = 0
b+7*b-102+6 = 0
8*b-96 = 0 // + 96
8*b = 96 // : 8
b = 96/8
b = 12
b = 12
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